Revenue from Contracts with Customers - Summary of Geographic Disaggregation of Net Sales (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Disaggregation Of Revenue [Line Items]
Net sales	$ 594,689	$ 556,405	$ 1,187,944	$ 1,107,823
Surfactants [Member]
Disaggregation Of Revenue [Line Items]
Net sales	411,456	379,795	841,793	770,615
Polymers [Member]
Disaggregation Of Revenue [Line Items]
Net sales	162,751	159,757	308,867	305,265
Specialty Products [Member]
Disaggregation Of Revenue [Line Items]
Net sales	20,482	16,853	37,284	31,943
North America [Member]
Disaggregation Of Revenue [Line Items]
Net sales	339,448	315,743	677,440	628,388
North America [Member] | Surfactants [Member]
Disaggregation Of Revenue [Line Items]
Net sales	234,364	220,520	486,099	450,110
North America [Member] | Polymers [Member]
Disaggregation Of Revenue [Line Items]
Net sales	88,251	79,828	161,044	149,637
North America [Member] | Specialty Products [Member]
Disaggregation Of Revenue [Line Items]
Net sales	16,833	15,395	30,297	28,641
Europe [Member]
Disaggregation Of Revenue [Line Items]
Net sales	141,415	132,183	287,422	268,672
Europe [Member] | Surfactants [Member]
Disaggregation Of Revenue [Line Items]
Net sales	74,605	63,460	156,203	134,238
Europe [Member] | Polymers [Member]
Disaggregation Of Revenue [Line Items]
Net sales	63,296	67,401	124,438	131,278
Europe [Member] | Specialty Products [Member]
Disaggregation Of Revenue [Line Items]
Net sales	3,514	1,322	6,781	3,157
Latin America [Member]
Disaggregation Of Revenue [Line Items]
Net sales	90,866	84,031	173,997	162,325
Latin America [Member] | Surfactants [Member]
Disaggregation Of Revenue [Line Items]
Net sales	90,527	83,569	173,291	161,437
Latin America [Member] | Polymers [Member]
Disaggregation Of Revenue [Line Items]
Net sales	204	326	500	743
Latin America [Member] | Specialty Products [Member]
Disaggregation Of Revenue [Line Items]
Net sales	135	136	206	145
Asia [Member]
Disaggregation Of Revenue [Line Items]
Net sales	22,960	24,448	49,085	48,437
Asia [Member] | Surfactants [Member]
Disaggregation Of Revenue [Line Items]
Net sales	11,960	12,246	26,200	24,830
Asia [Member] | Polymers [Member]
Disaggregation Of Revenue [Line Items]
Net sales	$ 11,000	$ 12,202	$ 22,885	$ 23,607